DE102015002900A1 - Filter system and filter element with coupling device - Google Patents

Abstract

The invention relates to a filter system (100) for filtering a fluid which comprises at least one filter element (10), a filter housing (108) with a cover (110) and a non - destructively separable coupling device (30). The coupling device (30) comprises at least two coupling parts (31, 33) for coupling the at least one filter element (10) to the cover (110), the coupling parts (31, 33) having a coupling element (36) and a corresponding coupling receptacle (34). include. In this case, the coupling element (36) and the coupling receptacle (34) in an intended engagement region (32) of coupling element (36) and coupling receptacle (34) are at least partially spherical. The coupling receptacle (34) comprises the coupling element (36) complementary to one another in the region of the engagement region (32), wherein at least regions (37, 35) of the coupling element (36) and coupling receptacle (34) engage one another at least when the coupling device (30) is loaded Form contact areas (37, 35) are spherical in shape. The invention further relates to a filter element (10) for installation in such a filter system (100), as well as the use of the filter system (100) as an oil or fuel filter.

Description

Technical area

The invention relates to a filter system for filtering a fluid with a coupling device between a filter element and a lid, in particular for use as an oil or fuel filter of an internal combustion engine, and a filter element for installation in such a filter system.

State of the art

From the DE 10 2008 062 556 A1 is known a connection between a lid of a filter housing of a fluid filter and an upper end plate of a filter element arranged in this filter element. Between the cover and the upper end plate an axial forces and torques transmitting carrier device is provided, which on the one hand is able to rotate when screwing or unscrewing the lid of a pot of the filter housing, the filter element as well as to adjust in the axial direction and at the same time the arrangement of to allow comparatively large filter element in the lid with respect to its diameter. For a release of the filter element from the lid for this purpose, the filter element can be easily twisted and then removed.

The entrainment device has mutually facing and engageable elements, in particular in the form of claw elements, on the one hand form an integral part of the lid and on the other hand are arranged directly or indirectly on the upper end plate of the filter element Next, the elements are designed such that these abut each other when mounting the lid and engage behind the pot when unscrewing the lid. Due to the elements formed in this way, both torques and axial forces can be transmitted both when mounting, ie when unscrewing the cover and when unscrewing, whereby it is always ensured when the cover is unscrewed that the filter element reliably rests against the cover of the cover Filter housing is fixed and held. To release the filter element from the lid, this only needs to be slightly rotated, for example, at an angle of 45 °, and can then be removed.

Disclosure of the invention

An object of the invention is to provide a filter system for filtering a fluid, which allows to remove a filter element from the filter system in a structurally simple and flexible manner without additional tools.

Another object of the invention is to provide a filter element for installation in such a filter system, which can be removed in a structurally simple and flexible manner without additional tools from the filter system.

The above objects are achieved according to one aspect of the invention of a filter system comprising at least one filter element, a filter housing with a lid, and a non-destructively separable coupling device, which consists of at least two coupling parts for coupling the at least one filter element with the lid. The coupling parts comprise a coupling element and a corresponding coupling receptacle. Furthermore, the objects are achieved by a filter element for installation in such a filter system comprising a coupling part.

Favorable embodiments and advantages of the invention will become apparent from the other claims, the description and the drawings.

It is proposed a filter system for filtering a fluid comprising at least one filter element, a filter housing with a lid, and a non-destructively separable coupling device with at least two coupling parts for coupling the at least one filter element with the lid. The coupling parts comprise a coupling element and a corresponding coupling receptacle. In this case, the coupling element and the coupling receptacle are at least partially spherical in an intended engagement region of coupling element and coupling receptacle. The coupling receptacle comprises the coupling element in the region of the engagement region complementary to one another in form, wherein at least portions of the coupling element and the coupling receptacle, which form mutual contact regions at least when the coupling device is subjected to tensile loading, are spherical in shape.

The filter system according to the invention, which can preferably be used as a stationary filter system on an internal combustion engine, has a filter element which comprises a coupling device on its upper end side on an upper end disk, which is designed in the form of a snap connection like a clip. The coupling device has small dimensions relative to the diameter of the filter element. The coupling element is arranged for example on the end plate of the filter element and the corresponding coupling receptacle on the lid. Alternatively, a reverse arrangement is also conceivable. The coupling element is in the form of a ball or a flattened in the axial direction ball. The coupling element in the form of the ball can, for example, rotationally symmetrical about the axial direction be formed while the coupling receptacle may be formed, for example in the form of a portion of a hollow ball with an opening for insertion of the coupling element, which may comprise the coupling element from the outside. For example, the coupling receptacle may be formed as a half-hollow sphere. At least portions of coupling element and coupling receptacle can form mutual contact areas at least when the coupling device is subjected to tensile loading.

The dimensions of coupling element and coupling receptacle are provided so that the coupling receptacle can be pushed upon placement of the coupling receptacle in the axial direction of the coupling element on the coupling element by applying a predetermined minimum force, so that it surrounds the coupling element partially complementarily form. In this case, the coupling receptacle is advantageously formed so far elastically at least in the region of the engagement region that coupling receptacle and coupling element can be coupled by pressing in the axial direction and by pulling in the axial direction under sufficient force also again be solved.

However, if the so coupled coupling device is pulled in the axial direction of the coupling element, the coupling device experiences at least a sufficiently high force, which causes the filter element can be pulled out of the filter housing with pulling on the lid. By tilting the lid against the axial direction of the lid can be released under the effect of a lever effect of the coupling receptacle on the coupling element from the coupling device and removed separately. The coupling device thus makes it possible to exert different forces on the connection of the cover and the filter element as a function of the relative orientation of the cover and the filter element relative to the axial direction.

The cover of the filter system can usually be made of a polymer, such as thermoplastic, but also a preparation of a metallic material is conceivable. The coupling device itself may be made of the same material as the cover and / or the material of the end plate of the filter element, for example polyurethane.

In an advantageous embodiment, the coupling receptacle, the coupling element based on a diameter of the ball by more than 60%, preferably more than 80%, for example, about 90% include. This ensures that the coupling receptacle, which encloses the coupling element in a complementary shape, can absorb sufficiently high forces in order to lift the filter element with the cover out of a filter housing.

In a further advantageous embodiment, the coupling receptacle with coupled coupling device can be tilted by an angle α against the axial direction. In this way it is possible to tilt the lid by the angle α against the filter element, which facilitates both the insertion of the filter element in the filter housing and the removal of the filter element from the filter housing. In addition, manufacturing and assembly tolerances can be compensated.

In an advantageous embodiment, the coupling element may be arranged on the filter element and the coupling receptacle on the cover. In this way, the lid can be flexibly placed with the coupling receptacle on the coupling element and removed again. Alternatively, however, the reverse embodiment with the coupling element on the cover and the coupling receptacle on the filter element is conceivable.

Advantageously, the coupling device by relative tilting of the coupling receptacle greater than the inclined α against the axial direction of the coupling element angle of the coupling element with a smaller force be releasable than by pulling the coupling receptacle in the axial direction. By tilting the coupling receptacle is reduced in a flattened in the axial direction ball, for example, in engagement with the coupling receiving effective axis of the coupling element, so that the coupling element can slide out of the coupling receptacle. Also can contribute to a lighter release of the coupling device so a certain amount of leverage when a part of the coupling receptacle on the coupling element.

Advantageously, the filter element can be pulled out of the filter housing with the cover coupled via the coupling device in the axial direction, whereby the cover can be released from the coupling device by tilting at an angle greater than the angle α inclined relative to the axial direction of the coupling element. With the lid, which is aligned so that the coupling receptacle is aligned in the axial direction to the coupling element, due to the higher possible tensile force on the coupling device, the filter element can be pulled out of the filter housing. However, if the lid is tilted so that the coupling receptacle is inclined at an angle α against the axial direction, the coupling receptacle can be released from the coupling element in a flattened ball or a non-flattened ball by leverage easier and the lid can be removed from the filter element.

In particular, the angle α can be at least 20 °, in order to achieve a sufficient manufacturing and assembly tolerance and to deduct the lid by tilting easier from the filter element can.

In an advantageous embodiment, the coupling element may be designed in the form of a flattened ball, wherein a shorter axis of the coupling element is aligned in the axial direction. As a result, it is possible that by tilting the coupling receptacle, an effective axis of the coupling element engaged with the coupling receptacle is reduced, so that the coupling element can slide out of the coupling receptacle.

In an alternative embodiment, the coupling element may have a disc-like shape, wherein a shorter axis of the coupling element is aligned in the axial direction. A disk-like shape can be considered as an extreme shape of a flattened ball, in which the ratio between long and short axis is very large. In this respect, a similar coupling device whose function is based on a difference between the long and short axis of the coupling element can be represented.

Conveniently, the coupling element may have a bore for venting the filter system. Especially when the operation of the filter system is a hole, which is preferably arranged in the axial direction of the coupling element, a very effective vent hole. In this way, very little air in the filter system, since the air can escape through the highest point of the filter system. This is particularly advantageous when using the proposed filter system as a fuel filter.

Advantageously, a closure means for a fluid drain opening in the filter housing may be arranged on the filter element, wherein the drain opening is releasable when opening the lid. Standing filter systems usually have a seal seat with a drain in a tank system or a reservoir, which must be raised when pulling out of the filter element. The coupling device according to the invention is designed such that when opening the lid via the coupling device, a force on the filter element is transferable, which is sufficient to release the drain opening. The drainage opening is thus released in the coupled state of the element and cover by exerting an axial tensile force on the filter element with the closure means in the installed state occlusive closure means, so that the fluid in the filter system can drain before the filter element completely removed from the filter housing via the lid coupled thereto becomes. This allows a clean filter element change during service.

Conveniently, the coupled coupling receptacle can be rotatably arranged in the axial direction against the coupling element. In this way, the lid can be rotated even with mounted coupling device, if it should be screwed tight against the filter housing, for example via a screw.

In an advantageous embodiment, the coupling device can be arranged centrally symmetrically in the filter system. This results in a favorable force distribution when pulling the filter element over the lid when the coupling device is closed. Especially with larger and heavier filter elements, as are common, for example, in the commercial vehicle sector, a symmetrical introduction of force for the function of the coupling device and its stable and comfortable handling is important.

Appropriately, a quick coupling may be provided, with which the lid is connectable to the filter housing. For example, a bayonet connection can prove to be a convenient way to quickly and safely close the lid when the coupling device is closed, thus sealing the filter system.

In an alternative embodiment, however, the cover with the filter housing can also be screwed and / or braced. Since the inventive solution of the coupling device allows rotation of the coupling receptacle against the coupling element, so the lid can also be screwed low on the filter housing. Alternatively or additionally, a tension, for example via snap hook conceivable. In particular, if the lid is made substantially flat, it is expedient to connect the lid via screws to the housing.

However, the coupling receptacle with its receiving jaws can also be displayed in a slim and straight, cylindrical shape, which is cheaper to manufacture, so that it is easier to produce, for example, in plastic injection molding technology. Furthermore, a coupling sleeve can be arranged centrally on the cover around the coupling receptacle, which surrounds the coupling receptacle. On the end plate can be arranged correspondingly a coupling ring which surrounds the coupling element. Both components serve the additional stabilization of the filter element with the Cover in assembled condition. The lid is then on the filter element with the coupling sleeve on the coupling ring directly on and is supported on the end plate of the filter element. In this way, the filter element in the filter housing with the lid closed and, for example screwed or locked, can be pressed into a sealing seat in the filter housing and is mounted so firmly and stably.

In another aspect, the invention relates to the use of the filter system as an oil or fuel filter. In these fluid filters usually replacement of the filter element after a predetermined mileage is necessary, so that the filter system is opened at regular intervals and removed the filter element, and a new filter element must be used, which is possible with the coupling device according to the invention in an advantageous manner.

According to a further aspect, the invention relates to a filter element for installation in a filter system, which comprises an end plate with a coupling part arranged thereon of a non-destructively separable coupling device, which is provided for cooperation with a corresponding coupling part of the coupling device.

Advantageously, the coupling parts may comprise a coupling element and a corresponding coupling receptacle, wherein the coupling element and the coupling receptacle are at least partially spherical in shape at least in an intended engagement region of coupling element and coupling receptacle. The coupling receptacle comprises the coupling element in the region of the engagement region complementary to one another in form, wherein at least portions of the coupling element and the coupling receptacle, which form mutual contact regions at least when the coupling device is subjected to tensile loading, are spherical in shape. By tilting the lid against the axial direction, the lid can be released from the coupling device due to a lever action or an axial flattening of the spherical shape of the coupling element and removed separately. The coupling device thus makes it possible, depending on the relative orientation of the cover and the filter element to the axial direction, to exert different forces on the connection of the cover and the filter element. The coupling element can be in the form of a sphere or a sphere flattened in the axial direction. The coupling element in the form of the ball may be formed, for example, rotationally symmetrical about the axial direction, while the coupling receptacle may be formed, for example in the form of a portion of a hollow ball with an opening for insertion of the coupling element, which may comprise the coupling element from the outside. For example, the coupling receptacle may be formed as a half-hollow sphere. At least areas of the coupling element and the coupling receptacle can thus form mutual contact areas at least when the coupling device is subjected to tensile loading.

Brief description of the drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

They show by way of example:

1 a sectional view of a filter system according to an embodiment of the invention in the closed state with attached lid;

2 an isometric sectional view of a coupling device according to an embodiment of the invention with closed coupling receptacle;

3 an isometric view of a coupling device according to another embodiment of the invention with slotted coupling receptacle;

4 a longitudinal section of a coupling device according to an embodiment of the invention in a direction tilted against an axial direction state;

5 a sectional view of a filter system with attached cover and vent hole in the coupling element according to an embodiment of the invention;

6 a sectional view of a filter system according to an embodiment of the invention in the removal of the filter element with the lid;

7 a sectional view of the filter system 6 in assembled condition.

Embodiments of the invention

In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.

1 shows a sectional view of a filter system 100 according to an embodiment of the Invention in closed condition with attached lid 110 , The filter system 100 for filtering a fluid comprises a filter element 10 , a filter housing 108 with a lid 110 , as well as a non-destructively separable coupling device 30 consisting of at least two coupling parts 31 . 33 for coupling the at least one filter element 10 with the lid 110 , wherein the coupling parts 31 . 33 a coupling element 36 and a corresponding coupling receptacle 34 include. The coupling element 36 and the coupler pocket 34 are in an intended intervention area 32 of coupling element 36 and coupler pocket 34 at least partially spherically formed. The coupler holder 34 includes the coupling element 36 in the area of the intervention area 32 complementary to each other, with areas 37 . 35 of coupling element 36 and coupler pocket 34 , at least at tensile load of the coupling device 30 mutual contact areas 37 . 35 form, are spherical. The coupler holder 34 includes the coupling element 36 based on a diameter of the ball by more than 60%, preferably more than 80%, in particular by about 90%.

The filter element 10 is in 1 as in the other figures only as a supporting structure with end plate 16 which the filter element 10 at the upper end 14 completes, without a filter bellows shown. The filter bellows can be arranged on an outer and / or inner surface of the supporting structure.

The coupling element 36 is on the filter element 10 and the coupler pocket 34 on the lid 110 arranged. The lid 110 sits in 1 in the axial direction L with the coupling receptacle 34 on the coupling element 36 , This represents the position in which with the lid 110 the filter element 10 out of the filter housing 108 can be pulled out.

The coupling element 36 can also be designed in the form of a flattened ball, in which case - as in 4 shown - a shorter axis 40 of the coupling element 36 aligned in the axial direction L. Alternatively, the coupling element 36 a disc-like shape, in which case a shorter axis 40 of the coupling element 36 aligned in the axial direction L.

The coupled coupler holder 34 is against the coupling element 36 rotatably arranged in the axial direction L. The coupling device 30 is more centrally symmetric in the filter system 100 arranged. There may be provided a quick coupling with which the lid 110 with the filter housing 108 is connectable. Alternatively, the lid 110 with the filter housing 108 be screwed and / or braced.

The filter system according to the invention 100 , which is preferred as a stagnant filter system 100 can be used on an internal combustion engine, has a filter element 10 on, that's an end plate 16 with a coupling part arranged thereon 31 . 33 a non-destructively separable coupling device 30 includes, for cooperation with a corresponding coupling part 33 . 31 the coupling device 30 is provided. The coupling parts 31 . 33 comprise a coupling element 36 and a corresponding coupling receptacle 34 , wherein the coupling element 36 and the coupler pocket 34 in a designated intervention area 32 of coupling element 36 and coupler pocket 34 at least partially spherical. The coupler holder 34 includes the coupling element 36 in the area of the intervention area 32 complementary to each other, at least areas 37 . 35 of coupling element 36 and coupler pocket 34 , at least at tensile load of the coupling device 30 mutual contact areas 37 . 35 form, are spherical.

The dimensions of coupling element 36 and coupler pocket 34 are provided so that the coupling receptacle 34 when fitting the coupling receptacle 34 under one against the axial direction L of the coupling element 36 inclined angle α, which falls below a predetermined angle of for example 20 °, on the coupling element 36 can be pushed, so that it is the coupling element 36 partially surrounds. However, on the so-coupled coupling device 30 in the axial direction L of the coupling element 36 pulled, experiences the coupling device 30 a higher resistance than oblique, which causes pulling on the lid 110 the filter element 10 out of the filter housing 108 can be pulled out. By tilting the lid 110 against the axial direction L, however, the lid can 110 due to a lever effect when a part of the coupling receptacle 34 on the coupling element 36 from the coupling device 30 be solved and removed separately. The coupling device 30 allows it so, depending on the relative orientation of the lid 110 and filter element 10 to the axial direction L different forces on the connection of cover 110 and filter element 10 exercise.

In 2 is an isometric sectional view of a coupling device 30 according to an embodiment of the invention with closed coupling receptacle 34 shown. The coupling element 36 is spherical in shape, while the coupling receptacle 34 in form of a Hollow ball is designed, which is open at one end, so that the coupling element 36 with sufficient elasticity of the coupling receptacle 34 can slide into it. areas 37 . 35 of coupling element 36 and coupler pocket 34 , at least at tensile load of the coupling device 30 mutual contact areas 37 . 35 form, are formed spherical. The coupler holder 34 includes the coupling element 36 based on a diameter of the ball by more than 60%, preferably more than 80%.

In 3 is an isometric view of a coupling device 30 according to a further embodiment of the invention with slotted coupling receptacle 34 shown. The coupler holder 34 expediently has several receiving jaws 44 on, passing through single slots 45 are separated from each other and which the coupling element 36 may include. By dividing the coupling receptacle 34 in individual intake jaws 44 is a certain elasticity of the coupling receptacle 34 allows, so closing and releasing the coupling device 30 is facilitated.

4 shows a longitudinal section of a coupling device 30 according to an embodiment of the invention in tilted against an axial direction L state. The coupler holder 34 is with her intake jaws 44 over the coupling element 36 pushed and holds in this position, the coupling device 30 in a closed function as the intake jaws 44 the coupling receptacle 34 at least partially enclose. The lid 110 is so in a predetermined angular range about the axial direction L against the filter element 10 swiveling what the assembly of the filter system 100 facilitated.

The coupler holder 34 is coupled coupling device 30 tilted by an angle α against the axial direction L. The coupling device 30 is by relative tilting of the coupling receptacle 34 larger one against the axial direction L of the coupling element 36 inclined angle α of the coupling element 36 detachable with a smaller force than by pulling the coupling receptacle 34 in the axial direction L. The relative tilt of the coupling receptacle 34 against the axial direction L may conveniently be in particular at least 20 ° to the coupling receptacle 34 from the coupling element 36 to deduct.

The filter element 10 is with the on the coupling device 30 coupled lid 110 in the axial direction L from the filter housing 108 extendable, with the lid 110 by tilting at an angle greater than that against the axial direction L of the coupling element 36 inclined angle α from the coupling device 30 is solvable.

In 5 is a sectional view of a filter system 100 with attached lid 110 illustrated according to an embodiment of the invention. In this case, the coupling element 36 a hole 38 for venting the filter system 100 on. When using the filter system 100 as an oil or fuel filter is just when the operation of the filter system 100 a hole 38 which preferably in the axial direction L of the coupling element 36 is arranged, a very effective vent hole. In this way, very little air remains in the filter system 100 because the air is above the highest point of the filter system 100 can escape. About the hole 38 and for example slots 45 the coupling receptacle 34 so can a vent between the interior of the filter housing 108 and the interior of the filter element 10 respectively.

Next, in a lower portion of the filter housing, not shown 108 a drain opening may be provided. Standing filter systems usually have a sealing seat with a drain in a tank system or a reservoir, which upon withdrawal of the filter element 10 must be drawn up so that the fluid from the filter system 100 can expire. The lower end plate of the filter element 10 in this case has a closure means which closes the drain opening during operation. When opening the lid 110 is via the coupling device 30 a force with axial component on the filter element 10 exerted so that the closure means releases the drain opening. In this case, the required force can automatically on the filter element 10 act, for example by unscrewing a screw between the filter housing 108 and lid 110 , or the lid 110 with coupled filter element 10 is raised manually in the axial direction.

6 shows a sectional view of a filter system 100 according to an embodiment of the invention in the removal of the filter element 10 with the lid 110 , The coupler holder 34 with their intake jaws 44 However, it is shown in a slim and straight shape, which is cheaper to manufacture, so that it is easier to produce, for example in plastic injection molding technology. The further difference is that around the coupling receptacle 34 a coupling sleeve 46 centric on the lid 110 is arranged, which is the coupling receptacle 34 includes. The coupling element 36 can in the coupling sleeve 46 to be moved in the axial direction L, wherein the coupling receptacle 34 the coupling element 36 insofar as that includes the coupling element 36 not from the coupling sleeve 46 can slip out. The filter element 10 can do so with the lid 110 out of the filter housing 108 be lifted out. In 6 is the filter system 100 shown in a state in which the filter element 10 with the lid 110 out of the filter housing 108 is lifted out. The coupling element 36 lies with his contact area 37 at the corresponding contact area 35 the coupling receptacle 34 on, so the lid 110 the weight of the filter element 10 can record.

In 7 on the other hand is a sectional view of the filter system 100 out 6 shown in the assembled state. This is the lid 110 directly on the edge of the filter housing 108 on. The lid 110 can with the filter housing 108 for example, screwed or locked or clipped. The coupling element 36 is in the coupling sleeve 46 pushed upwards and is not at the contact area 35 the coupling receptacle 34 at.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008062556 A1 [0002]

Claims (15)

Filter system ( 100 ) for filtering a fluid, comprising - at least one filter element ( 10 ), - a filter housing ( 108 ) with a lid ( 110 ), - a non-destructively separable coupling device ( 30 ), with at least two coupling parts ( 31 . 33 ) for coupling the at least one filter element ( 10 ) with the lid ( 110 ), wherein the coupling parts ( 31 . 33 ) a coupling element ( 36 ) and a corresponding coupling receptacle ( 34 ), wherein the coupling element ( 36 ) and the coupling receptacle ( 34 ) in a designated intervention area ( 32 ) of coupling element ( 36 ) and coupling receptacle ( 34 ) are formed at least partially spherically and the coupling receptacle ( 34 ) the coupling element ( 36 ) in the area of the intervention area ( 32 ) complementary to one another, at least regions ( 37 . 35 ) of coupling element ( 36 ) and coupling receptacle ( 34 ), which at least at tensile load of the coupling device ( 30 ) mutual contact areas ( 37 . 35 ) are formed spherical. Filter system according to claim 1, wherein the coupling receptacle ( 34 ) the coupling element ( 36 ) based on a diameter of the ball by more than 60%, preferably more than 80%. Filter system according to claim 1 or 2, wherein the coupling receptacle ( 34 ) with coupled coupling device ( 30 ) is tiltable by an angle (α) against the axial direction (L). Filter system according to one of the preceding claims, wherein the coupling element ( 36 ) on the filter element ( 10 ) and the coupling receptacle ( 34 ) on the lid 110 ) are arranged. Filter system according to one of the preceding claims, wherein the coupling device ( 30 ) by relative tilting of the coupling receptacle ( 34 ) greater than the against the axial direction (L) of the coupling element ( 36 ) inclined angle (α) of the coupling element ( 36 ) is releasable with a smaller force than by pulling the coupling receptacle ( 34 ) in the axial direction (L). Filter system according to one of the preceding claims, wherein the filter element ( 10 ) with the via the coupling device ( 30 ) coupled lid ( 110 ) in the axial direction (L) from the filter housing ( 108 ) is extendible, wherein the lid ( 110 ) by tilting at an angle greater than that against the axial direction ( 1 ) of the coupling element ( 36 ) inclined angle (α) from the coupling device ( 30 ) is solvable. Filter system according to one of the preceding claims, wherein the angle (α) is at least 20 °. Filter system according to one of the preceding claims, wherein the coupling element ( 36 ) is designed in the form of a flattened sphere, with a shorter axis ( 40 ) of the coupling element ( 36 ) is aligned in the axial direction (L). Filter system according to one of claims 1 to 7, wherein the coupling element ( 36 ) has a disc-like shape, wherein a shorter axis ( 40 ) of the coupling element ( 36 ) is aligned in the axial direction (L). Filter system according to one of the preceding claims, wherein the filter element ( 10 ) associated coupling part ( 31 . 33 ) a hole ( 38 ) for venting the filter system ( 100 ) having. Filter system according to one of the preceding claims, wherein on the filter element ( 10 ) a closure means for a drainage opening for the fluid in the filter housing ( 108 ), wherein the drain opening when opening the lid ( 110 ) is releasable. Filter system according to one of the preceding claims, wherein the coupled coupling receptacle ( 34 ) against the coupling element ( 36 ) is rotatably arranged in the axial direction (L). Filter system according to one of the preceding claims, wherein the coupling device ( 30 ) centrally symmetric in the filter system ( 100 ) is arranged. Filter element ( 10 ) for installation in a filter system ( 100 ) according to one of the preceding claims, comprising an end plate ( 16 ) with a coupling part arranged thereon ( 31 . 33 ) of a non-destructively separable coupling device ( 30 ), which cooperate with a corresponding coupling part ( 33 . 31 ) of the coupling device ( 30 ) is provided. Filter element according to claim 14, wherein the coupling parts ( 31 . 33 ) a coupling element ( 36 ) and a corresponding coupling receptacle ( 34 ), wherein the coupling element ( 36 ) and the coupling receptacle ( 34 ) at least in a designated intervention area ( 32 ) of coupling element ( 36 ) and coupling receptacle ( 34 ) are formed at least partially spherically and the coupling receptacle ( 34 ) the coupling element ( 36 ) in the area of the intervention area ( 32 ) complementary to one another, at least regions ( 37 . 35 ) of coupling element ( 36 ) and coupling receptacle ( 34 ), at least at Tensile load of the coupling device ( 30 ) mutual contact areas ( 37 . 35 ) are formed spherical.

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